MOGADISHU — At least eight Somali government troops were killed when a remote-controlled bomb hit their vehicle in Mogadishu, officials said on Thursday, highlighting lingering security risks less than two weeks before the UN-backed government's mandate ends.Somalia's Al-Shabaab group claimed responsibility for the attack on Wednesday evening. Government troops and African Union peacekeepers say they have tightened security before a presidential election on August 20 when the transitional government will be dissolved. — Reuters